Operating unit for double-acting pumps



Oct. 20, 1931. A. H. KENNEDY 1,828,570

OPERATING UNIT FOR DOUBLE ACTING PUMPS Filed Jan. 13, 1950 2Sheets-Sheet l &

Flo A-H K INVEN'liO g V m ATTORNEYS Oct. 20, 1931. A. H. KENNEDY1,328,570

OPERATING UNIT FOR DOUBLE ACTING PUMPS Filed Jan. 13, 1930 2Sheets-Sheet 2 b a W x 24, o s u INVENTOR ATTORNEYS 4'0" (not'show n).

flanged fitting 13 threaded on its upper end.

Patented Oct. 20, 1931 PATENT OFFICE ALBERT H. KENNEDY, OF ROGKPOR'I',INDIANA OPERATING UNIT FOR DOUBLE-ACTING IPUIVIP S Application filed2I'anuary13, 1930. SerialNo. 420,531.

This invention relates to pumps and, among other objects, aims toprovide improved, simple, efiicient operating mechanism for adouble-acting overlapping-stroke pump designed for use in both deep andshallow wells;

Other aims and advantages of the invention will appear in thespecification when considered in. connection with the accomm panyingdrawings, wherein: Y a

Fig. 1 is a sectional view, partly in elevation, showing the preferredform of pump gearing;

Fig. 2 is a front end elevation;

Fig. 3 is a transverse sectional view taken on the line 3-3 of Fig. 1; V

Fig. 4 is a sectional view taken on the line 4-4 of F ig. 1, withcertain parts shown in a different position; and v Figl dis a top planview base. 1

Heretofore, the operating mechanism for double-acting,overlapping-stroke pumps v has been very complex and expensive.Moreover, it has been exceedingly difficult to remove from its positionover a well casing in order to make repairs. Further,the operating partssubjected to the greatestwear have notbeen easily accessible. Thisinvention, 0 therefore, aims to improve and simplify the operatingmechanism for such pumps so as to enableit to be assembled, mounted, removed, dismantled and repaired without a great loss of time. p a pReferring particularly to the drawings, the illustrated mechanism isthere connected to operate a pair ofconcentric or telescoping suckerrods 10 andll-which extend into a well casing 12 and carry the usualpistons The casing herein has a 6 of a supporting and the sucker rodsextend through a stuffing box 14: in a cover plate 15 on the upper endof said fitting,

ported on concrete footings or sills 16 on opposite sides of the casing.A base 17 preferably in the form ofa cast metal pan is convenientlysecured to the "footings and presents an opening 18 in one end adaptedto re- In this example, the mechanism is supceive the casing head 13 asshown in Figs. 1 and 2. The arrangement is such that the base supportsthe casing in proper alinement.

The pump gearing is here shown as being mounted between a pair ofopposed cast metal frame plates 19 removably secured at their lower endson the base 17 and connected together by a plurality of struts or spacermembers20. Suitable cap screws orbolts pass through the plates andsecure them to the struts. The idea is to enable one of the side platesto be removed without disturbing struts or other parts so as'to affordeasy and quick access to the parts between the plates. Moreover, thelower edges of the plates may be disconnected'from the base and thewhole mechanism slid back on the baseto 'afiord easyaccess to the wellcasing;

A driving shaft having a pulley 22 secured to one end 21 is shownasbeing journaled substantially centrally of the two plates 19. 'On theshaft is a pair of spur gears 23 adjacent. to the opposed plates. Thesesmall gears mesh with larger gears 24 one above the shaft and the otherbelow theshaft so thattheir associated parts are easily accessiblewithout necessitating 1 removal of a number of other parts. These gearsare shown as being mounted on tapered portions extending through hollowbosses 27 in the respective side plates and terminat ing in screwthreaded ends 28 so that the tapered bearings may be adjusted andtightenedby nuts 29.

Now, in this example, eachof the gears 24 is connected to drive one ofthe sucker rods 10 and 11. For this purpose, a pair of rocket oroscillating arms 33 presenting elongated hubs 34 journaled on fixedshafts 35 extending through the plates (Fig. 4) are arranged to beoperated by wrist pins 36 on the respective gears. These arms are shownin Fig. 3 as being arranged one above the other so as to oscillate in acommon vertical plane throughthe axis of the sucker The operating armsterminate in yokes 39 (Fig. 4) and are connected to specially shapedcrossheads 40 and 41 on the respective sucker rods by means of pairs ofconnecting rods or links 43 pivotally connected to the yokes and to thecrossheads (Figs. 2 and 4). The arrangement is such that the arms willnot tend to bend the sucker rods as the yokes oscillate in circulararcs. This connection between the lower arm to the upper crosshead andthe upper arm to the lower crosshead not only enables the connectingrods to be made of adequate length but, also, cuts down the height ofthe operating mechanism to a minimum for any desired overlap of thestrokes. The overlap for each revolution of the driving gears happens tobe about 60 in this instance, but it may be varied by moving the pivotshafts for arms toward or away from the gears.

The crosshead 40 is so shaped that the connecting rods 42 for thecrosshead 41 can reciprocate between the connecting rods 42 whichconnect the crosshead 40to the upper arm (Figs. 1 and 4). Herein, thiscrosshead is formed of a casting presenting channels 43 on oppositesides of the sucker rod so as to afiord ample room for the lower pair ofconnecting rods to move laterally as the lower arm oscillates. Also,this crosshead conveniently has a vertical slot 44 in its front wall sothat it may be easily slipped on the sucker rod and secured to it. Acover plate 45 is preferably bolted on the frontwall of the crossheadacross the slot. The side walls or flanges herein have integralt'runnions 46 to which the connecting rods are pivoted. All of the otherpivotal connections preferably are similar to these because of theeconomy effected in making them.

The upper crosshead 41 is shown as being a simple, narrow cast metalblock secured to the upper end portion of the inner sucker rod 10.. Theconnecting rods 42 are connected to trunnions projecting from its sidewalls like those just described on the lower crosshead.

Both crossheads present similar T shaped extensions 47 integral withtheir rear walls and these extensions are machined to slide in the samevertical guide which is preferably composed of a flat strip of sheetmetal 48 and a pair of angle members 49 suitably secured to it at theopposite edges. The strip 48 is conveniently secured by screws'or bolt-sto the front set of struts 20 which are arranged in a vertical row. Thearrangement is such that the guide may be quickly and easily assembledand dismantled. Further, it eliminates a great deal of expensivemachining.

To provide for continuous, automatic lubrication of the vbearings, thereis shown an oil reservoir or tank 50 arranged between the side frameplates 19 and supported at its op-- posite ends on the upper struts 20(Fig.1).

The pan-shaped base is utilized as a settling basin for the drippings,having a series of staggered webs or upstanding ribs 51 to cause the oilto flow in a tortuous or zigzag path into a sump compartment at one end,a pair of inclined drip boards 52 being arranged to drain the oil intothe compartment at the opposite end. The oil is pumped to the reservoirby means of a pump 53 operated by a connecting rod 54 on the lowerrocker arms, a small valved conduit or tube 55 projecting through thebottom of the reservoir. The oil isfed by gravity through a series oftubes 56 to the various bearings and gears (Fig. The gears and rockerarms are flood oiled and all of the oil is recovered.

' From the foregoing description, it will be seen that the improvedoperating mechanism is very compact in its design; that all of the partsmaybe standardized and manufactured very cheaply; that it may be quicklyand easily assembled and dismantled by any ordinary mechanic; and thatit affords quick and easy access to allof the major parts for inspectionand/or repairs. Further, all of the mechanism may be assembled as a unitand i set in place over a well casing, the slot in thebase making iteasy to aline the parts properly. Moreover,-the whole thing may bequickly moved to one side to afford ac cess to the well.

Obviously, the present invention is not restricted to the particularembodiment thereof herein shown and described. Moreover, it is notindispensable that all the features of the invention be used conjointlysince they may be employed advantageously in various combinations andsub-combinations.

What is claimed is:

1. In a double-acting, overlapping stroke pump, a pair of concentricsucker rods each having a crosshead near its upper end; a frame; acrosshead guide mounted on the frame; separate driving gears between thesides of the frame; rocker arms arranged one above the other in theframe; anti-friction wrist pin connections between the rocker arms andthe gears; vokes on the ends of said arms straddling said crossheadguide; a pair of pivoted links connecting the yoke of the lower arm tothe upper crosshead; and a pair of links connecting the upper arm to thelower crosshead, one pair of links being arranged to operate between theother.

2. In a double-acting, overlapping stroke pump, a pair of concentricsucker rods each having a crosshead near its upper end; a frame; acrosshead guide mounted on the frame; separate driving gears between thesides of the frame; rocker arms arranged one above the other in theframe; anti-friction wrist pin connections between the ro'cker arms andthe gears; yokes on the ends of said arms straddling said crossheadguide; means connecting the yoke of the lower arm to the uppercrosshead; and means connecting ihegoke of the upper arm to the lowercross- 3. In combination with a well casing having a pair of concentricpump sucker rods projecting through the upper end, pum operatingmechanism comprising a base removably associated with the upper end ofthe cas- V ing; side frame members removably secured to the base; strutsconnecting the side frame members; a single crosshead guide mounted onsome of the struts crosshea-ds on thesucker rods arranged one above theother and slidaby mounted in said guide; operating gears in said framearranged one above the other; rocker arm connected to said gears;

and means connecting said rocker arms to the respective crossheads.

4. In combination with a well casing having a pair of concentric pumpsucker rods projecting through the upper end, pump operating mechanismcomprising a base removably associated with the upper end of the casing;side frame members removably secured to the base; struts connecting theside frame members; a single crosshead guide mounted on some of thestruts; crossheads on the sucker rods arranged one above the other andslidably mounted in said guide; one of said crossheads having verticalchannels on opposite sides of its sucker rod; separated rocker armsarranged one above the other in said frame; means to operate said rockerarms; and pairs of links connecting the rocker arms to the respectivecrossheads, one pair of the links extending through said channels in oneof the crossheads 5. In a pump operating unit of the class described; aframe including a metal base having an opening near one end adapted toreceive a well casinghead and support the casing and operating unit inproper a1inement; a pair of separately removable side frame members; andseparated driving gears one above the other between the side framemembers, said driving gears and their associated parts being readilyaccessible and removable when one of said side frame members is removed.

In testimony, that I claim the foregoing as my own, I have heretoaffixed my signature.

ALBERT H. KENNEDY.

